Dota 2 hero voice mods
Voice lines, ability sounds, and everything else a hero makes. These live in the folder named after your audio language, which is worth knowing before you install one.
The D2PFX catalog has 37 mods in this category. Each changes what you see on your own screen; everyone else sees their own game.
Shadow Fiend Ult Miura Xm Aura
Naga Siren Growth Correction
Shadow Fiend Desire Requiem
Dili Tili Bom Pudge
Centaur Otday
Enigma Black Hole Kate Scream
Techies Bismillah Blast Off!
Brewmaster Kishmesh Amor
Axe Ultimate Clap Clap
Hirako Shinji Mars Arena
Mars Spear I Forgive You
Sniper Ultimate Headshot
Tusk Shards Got Taunt
Ogre Magi Taunt
Anti-Mage Taunt
Shadow Fiend Taunt
Bane Sleep Mimimi
Bounty Hunter Taunt
Hoodwink Taunt
Invoker Andrey Sun Strike
IO Relocate Rocket
Terrorblade Cursed Metamorphosis
Largo Serega Pirat
Largo Serega Pirat v2
Lion Taunt
Naga Siren Serega Pirat
Shadow Shaman Taunt
Undying Taunt
Witch Doctor True Maledict
Axe Rip Your Head
Sven Already Red
Ursa Already Red
Spirit Breaker Beer
Kunkka Sailor Taunt
Nature Prophet Taunt
Witch Doctor Death Ward
Enigma Black Hole Kate
Installing any of these
Open Dota 2 Mod Manager, find the hero, press Install. The app puts the file in a free pak slot in the folder your game mounts, tells you when two mods carry the same file, and puts everything back after a Dota patch. The full guide, or the manual route if you would rather do it yourself.